From patchwork Mon Apr 24 19:20:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Cody X-Patchwork-Id: 754417 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wBbv02YNwz9s03 for ; Tue, 25 Apr 2017 05:26:52 +1000 (AEST) Received: from localhost ([::1]:45613 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d2jdJ-0006hd-Rk for incoming@patchwork.ozlabs.org; Mon, 24 Apr 2017 15:26:49 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46721) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d2jX6-0001gn-WC for qemu-devel@nongnu.org; Mon, 24 Apr 2017 15:20:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d2jX6-0002oh-2U for qemu-devel@nongnu.org; Mon, 24 Apr 2017 15:20:24 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39222) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d2jX0-0002k6-S7; Mon, 24 Apr 2017 15:20:18 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D3ADBC218679; Mon, 24 Apr 2017 19:20:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D3ADBC218679 Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jcody@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com D3ADBC218679 Received: from localhost (ovpn-120-118.rdu2.redhat.com [10.10.120.118]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9D6371899C; Mon, 24 Apr 2017 19:20:17 +0000 (UTC) From: Jeff Cody To: qemu-block@nongnu.org Date: Mon, 24 Apr 2017 15:20:01 -0400 Message-Id: <20170424192002.18622-12-jcody@redhat.com> In-Reply-To: <20170424192002.18622-1-jcody@redhat.com> References: <20170424192002.18622-1-jcody@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 24 Apr 2017 19:20:18 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL v2 11/12] block/rbd: Add support for reopen() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, jcody@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This adds support for reopen in rbd, for changing between r/w and r/o. Note, that this is only a flag change, but we will block a change from r/o to r/w if we are using an RBD internal snapshot. Reviewed-by: Stefan Hajnoczi Signed-off-by: Jeff Cody Reviewed-by: John Snow Message-id: d4e87539167ec6527d44c97b164eabcccf96e4f3.1491597120.git.jcody@redhat.com --- block/rbd.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/block/rbd.c b/block/rbd.c index 35853c9..6471f4f 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -668,6 +668,26 @@ failed_opts: return r; } + +/* Since RBD is currently always opened R/W via the API, + * we just need to check if we are using a snapshot or not, in + * order to determine if we will allow it to be R/W */ +static int qemu_rbd_reopen_prepare(BDRVReopenState *state, + BlockReopenQueue *queue, Error **errp) +{ + BDRVRBDState *s = state->bs->opaque; + int ret = 0; + + if (s->snap && state->flags & BDRV_O_RDWR) { + error_setg(errp, + "Cannot change node '%s' to r/w when using RBD snapshot", + bdrv_get_device_or_node_name(state->bs)); + ret = -EINVAL; + } + + return ret; +} + static void qemu_rbd_close(BlockDriverState *bs) { BDRVRBDState *s = bs->opaque; @@ -1074,6 +1094,7 @@ static BlockDriver bdrv_rbd = { .bdrv_parse_filename = qemu_rbd_parse_filename, .bdrv_file_open = qemu_rbd_open, .bdrv_close = qemu_rbd_close, + .bdrv_reopen_prepare = qemu_rbd_reopen_prepare, .bdrv_create = qemu_rbd_create, .bdrv_has_zero_init = bdrv_has_zero_init_1, .bdrv_get_info = qemu_rbd_getinfo,